US5002913AExpiredUtilityPatentIndex 54

Dielectric ceramics for high frequency

Assignee: MITSUBISHI ELECTRIC CORPPriority: Dec 27, 1988Filed: Dec 20, 1989Granted: Mar 26, 1991

Est. expiryDec 27, 2008(expired)· nominal 20-yr term from priority

Inventors:YAMADA AKIRA KAWAMATA SUSUMU NAKAJO HIROSI WATARAI HISAO

C04B 35/465H01B 3/12H01P 7/10

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Claims

Abstract

A dielectric ceramics for high frequencies having its dielectric constant of as high as 80 and a sufficiently high Q value (1/dielectric loss) of 1,000 or above, even in a micro-wave region, which is a compound having a structure of Sr3Ti2O7, and being represented by the following general formula: Sr3(1-x)Ca3xTi2O7 (where: 0.1<x</=0.55).

Claims

exact text as granted — not AI-modified

What is claimed is: 
     
       1. A dielectric ceramic having a structure of Sr 3  Ti 2  O 7 , and being represented by the following general formula: Sr 3 (1-x) Ca 3x  Ti 2  O 7  where: 0.1&lt;x≦0.55. 
     
     
       2. The dielectric ceramic according to claim 1, having a relative dielectric constant of at least 80 and a Q value of at least 1,000 in the micro-wave region.

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